新建有轨电车线路对周边街道商业活力的直接效应与溢出效应：一种合成控制方法
Direct and spillover effects of a new tramway line on the commercial vitality of peripheral streets. A synthetic-control approach
AI总结：
本文基于合成控制方法，在潜在结果框架下研究佛罗伦萨轻轨线路对所在街道零售密度的直接效应及对周边街道的溢出效应，并正式定义了部分干扰假设下的相关因果效应。
摘要：
在城市中，轻轨等公共交通基础设施的建设会在非常细致的空间尺度上引发变化，同一城市街区内相邻处会呈现不同的情况。我们研究了在佛罗伦萨（意大利）建设的一条轻轨线路对其所在街道零售密度的直接效应，以及对受处理街道周边其他街道的溢出效应。为此，我们探讨了在处理单元与未处理单元之间可能存在干扰的面板比较案例研究中，合成控制组（SCG）方法的应用，这是SCG方法论文献中鲜少研究的问题。我们在潜在结果框架下展开讨论。在部分干扰假设下，我们正式定义了相关的直接和溢出因果效应。我们还考虑了在受处理单元周边的另一条街道被分配接受干预的假设场景下，受处理街道的“未实现”溢出效应。
英文摘要：
In cities, the creation of public transport infrastructure such as light rails can cause changes on a very detailed spatial scale, with different stories unfolding next to each other within a same urban neighborhood. We study the direct effect of a light rail line built in Florence (Italy) on the retail density of the street where it was built and and its spillover effect on other streets in the treated street's neighborhood. To this aim, we investigate the use of the Synthetic Control Group (SCG) methods in panel comparative case studies where interference between the treated and the untreated units is plausible, an issue still little researched in the SCG methodological literature. We frame our discussion in the potential outcomes approach. Under a partial interference assumption, we formally define relevant direct and spillover causal effects. We also consider the ``unrealized'' spillover effect on the treated street in the hypothetical scenario that another street in the treated unit's neighborhood had been assigned to the intervention.
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